External hdd problem

Hello,

i am not able to format my external hdd. i tried it in diskpart but it shows error encountered
event viver shows this

"Log Name: System
Source: Disk
Date: 11/22/2012 9:59:04 PM
Event ID: 51
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: my -PC
Description:
An error was detected on device \Device\Harddisk3\DR3 during a paging operation.
Event Xml:
1 answer Last reply
More about external problem
  1. Test the drive with the makers diagnostic Windows utility to see if it has failed.
    The various links are here: http://www.tacktech.com/display.cfm?ttid=287
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